单项选择题

In total darkness, doves ______.

A．circle helplessly
B．use landmarks
C．find their way by clouds
D．fly back home
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单项选择题
The reason why birds don't get lost on long flight ______.
A．has been discovered recently
B．is known by everybody
C．still remains a mystery
D．has been known to scientists for years
单项选择题
Under man-made stars, the bird in the cage ______.
A．tried to fly in the opposite direction of birds not caged
B．changed direction when the position of the stars was changed
C．wouldn't fly well
D．stayed where they were
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